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| year | consumption | change |
| 1980 | .06 | NA |
| 1981 | .06 | 0.00% |
| 1982 | .06 | 1.79% |
| 1983 | .06 | 8.77% |
| 1984 | .07 | 6.45% |
| 1985 | .07 | -1.52% |
| 1986 | .07 | 4.62% |
| 1987 | .07 | 2.94% |
| 1988 | .07 | 4.29% |
| 1989 | .08 | 4.11% |
| 1990 | .08 | 2.63% |
| 1991 | .08 | -3.85% |
| 1992 | .08 | 2.67% |
| 1993 | .08 | 5.19% |
| 1994 | .08 | 1.23% |
| 1995 | .08 | 2.44% |
| 1996 | .09 | 7.14% |
| 1997 | .09 | 4.44% |
| 1998 | .10 | 9.57% |
| 1999 | .11 | 8.74% |
| 2000 | .12 | 6.25% |
| 2001 | .12 | 1.68% |
| 2002 | .13 | 3.31% |
| 2003 | .13 | 0.80% |
| 2004 | .13 | 1.59% |
| 2005 | .13 | 0.78% |
| 2006 | .14 | 11.63% |
| 2007 | .16 | 13.89% |
| 2008 | .21 | 29.27% |
| 2009 | .21 | 0.00% |
| 2010 | .21 | 0.00% |
| 2011 | .21 | 0.47% |
| 2012 | .21 | -3.29% |
| 2013 | .20 | -0.97% |
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